code: def test_encrypt_decrypt_roundtrip():
      data = b"this is my plaintext \0\1\2\3"
      encrypted = t1f.Type1Font._encrypt(data, "eexec")
      decrypted = t1f.Type1Font._decrypt(encrypted, "eexec")
      assert encrypted != decrypted
      assert data == decrypted
  
file_path: matplotlib/lib/matplotlib/tests/test_type1font.py
imports: import matplotlib._type1font
  import os.path
  import difflib
  import pytest
label_desc: Use image node_id 6 for calling a global function with example usage: test_encrypt_decrypt_roundtrip() without return types